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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a— )� Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> A <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P412405 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G093Z-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/11/05 10 44 <br /> VoIatlle Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P412405-01)Water Sampled 12/21/04 14 45 Received 1212210413 15 <br /> Tert-amyl methyl ether ND 25 ugA 25 5010028 01/04/05 01/04/05 EPA 8260B <br /> Benzene 220 12 " <br /> Tert-butyl alcohol ND 500 ^ " <br /> Di-isopropyl ether ND 25 " <br /> 1,2-Dibromoethane(EDB) ND 12 " <br /> 1,2-Dichloroethane ND 12 <br /> Ethanol ND 2500 " ^ <br /> Ethylbenzene 220 i 12 " <br /> Ethyl tert-butyl ether ND 25 ^ <br /> Methyl tert-butyl ether 340 " 12 " <br /> Toluene ND 12 " <br /> Xylenes(total) 790 /- 12 ^ " <br /> Surrogate Dibromofluoromethane 96% 84-122 " <br /> W <br /> rrogate 12-Dichloroethane-d4 107% 74-135rrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> MW-2(P412405-02)Water Sampled 12/21/04 17 45 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND 1 0 ug11 1 5010028 01/04/05 01/04/05 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EBB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 18 <br />